乙烯层流反扩散火焰形状的理论计算及实验测量

Theoretical Calculation and Experimental Measurement of the Shape of Ethylene Laminar Inverse Diffusion Flame

利用高光谱仪对不同空气流量的乙烯层流反扩散火焰数据进行测量,由CH*自由基的化学发光强度分布得到实验测量的火焰形状.同时将扩展Roper模型用于计算反扩散火焰的形状,对模型中速度分布和温度分布进行改进,并将计算结果与实验测量结果进行对比.结果表明:随着空气流量的增加,火焰形状有变宽变高的趋势;相比于Sunderland等提出的4种速度温度分布模型,本文采用的速度、温度分布模型计算得到的反扩散火焰形状更加符合实验测量结果.

The hyperspectral imager was used in this paper to measure the data of ethylene laminar inverse diffusion flame with different air flow rates,and the experimentally measured flame shapes were obtained from the distribution of chemiluminescence intensity of CH*radicals.Meanwhile,the extended Roper model was used to calculate the inverse diffusion flame shape,the distributions of velocity and temperature in the model were improved,and the calculated results were compared with the measurement results.Results show that as the air flow rate increased,the flame shape became wider and higher.Compared with the four different velocity and temperature distribution models proposed by Sunderland et al,the flame shape calculated by the velocity and temperature distribution model developed in this paper can better match the measurement results.